| Number | Date | Country | Kind |
|---|---|---|---|
| 63-314110 | Dec 1988 | JPX |
| Number | Name | Date | Kind |
|---|---|---|---|
| 4613730 | Fechalos et al. | Sep 1986 | |
| 4763356 | Day, Jr. et al. | Aug 1988 | |
| 4788720 | Brennan et al. | Nov 1988 |
| Entry |
|---|
| "Intelligent Telephone Sets", H. Strobel, TELECOMMUNICATIONS, Dec. 1980, pp. 59-61. |
| "An Interactive Touch Phone for Office Automation", R. Hsing et al., IEEE Communications Magazine, vol. 23, No. 2, Feb. 1985, pp. 21-26. |